Fire Protection Fundamentals Practice Test

Which stage follows when fuel is nearly exhausted and oxygen becomes scarce, causing the fire to die down?

Backdraft Growth Stage Decay Stage Flashover

Correct Answer:

Decay Stage

Explanation:

Understanding how a fire behaves as fuel is depleted and oxygen becomes scarce helps explain why this is the decay stage. In decay, the heat release rate drops because there isn’t enough fuel or air to sustain the fire, so flames diminish and may go out while the space remains hot and smoky. The situation is a gradual fading rather than a rapid ignition event. This differs from backdraft, which is a sudden flare when fresh air re-enters a space filled with hot, fuel-rich gases; from the growth stage, where the fire is intensifying due to ample fuel and oxygen; and from flashover, where intense heat causes all exposed fuels to ignite almost simultaneously.

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